A bag manufacturing and packaging apparatus manufactures a bag by sealing a packaging material formed in a tubular shape and at the same time fills the bag with articles to be packaged. The bag manufacturing and packaging apparatus includes a conveyance mechanism, a squeezing mechanism and a conveyance adjusting unit. The conveyance mechanism is configured and arranged to convey the packaging material in a conveying direction. The squeezing mechanism includes a squeezing unit configured and arranged to sandwich the packaging material and to perform a squeezing motion so as to move the articles to be packaged to the downstream side in the conveying direction. The conveyance adjusting unit configured and arranged to move the packaging material towards the upstream side in the conveying direction during the squeezing motion of the squeezing unit.